I use a BC85.1 which I think is a powerline pillow with 5 outlets. I purchased it because at the time I lived in an old apartment and the sound was hazy during the day. Plugging in the 85.1 immediately took the hardness out of the upper frequencies. Dynamics were actually improved and the whole system became quieter and...more intimate?? Pretty neat product. I may sell it eventually to try ot Gilbert's Music Ring product. I woudl give it a 2. It did help things along, and now that I've moved I'm going to try and A/B with it in the system and out.
-Vik
-Vik